“New transmission lines are paid for by consumers through their bills, and any regulated transmission projects that are being built must provide long term benefits to consumers, and those benefits need to be greater than their costs.

“It is the role of the Commonwealth to ensure that consumers are not paying unnecessary costs.

“It is critical to ensure the right projects get built, at the right time, but it’s equally important to protect customers from overbuilding or gold-plating the network.”

Under the agreed rules, the Australian Energy Regulator (AER) is responsible for producing two sets of guidelines that set out the approach AEMO must take in producing the ISP.

The AER also retains its powers to monitor compliance with the requirements set out in the laws and rules, and will continue to decide if the costs proposed by networks to deliver transmission projects are efficient.

AEMO is expected to publish the final version of its 2020 ISP in mid-2020.